x^2+2x-0.6214=0

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Solution for x^2+2x-0.6214=0 equation:


Simplifying
x2 + 2x + -0.6214 = 0

Reorder the terms:
-0.6214 + 2x + x2 = 0

Solving
-0.6214 + 2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '0.6214' to each side of the equation.
-0.6214 + 2x + 0.6214 + x2 = 0 + 0.6214

Reorder the terms:
-0.6214 + 0.6214 + 2x + x2 = 0 + 0.6214

Combine like terms: -0.6214 + 0.6214 = 0.0000
0.0000 + 2x + x2 = 0 + 0.6214
2x + x2 = 0 + 0.6214

Combine like terms: 0 + 0.6214 = 0.6214
2x + x2 = 0.6214

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 0.6214 + 1

Reorder the terms:
1 + 2x + x2 = 0.6214 + 1

Combine like terms: 0.6214 + 1 = 1.6214
1 + 2x + x2 = 1.6214

Factor a perfect square on the left side:
(x + 1)(x + 1) = 1.6214

Calculate the square root of the right side: 1.273342059

Break this problem into two subproblems by setting 
(x + 1) equal to 1.273342059 and -1.273342059.

Subproblem 1

x + 1 = 1.273342059 Simplifying x + 1 = 1.273342059 Reorder the terms: 1 + x = 1.273342059 Solving 1 + x = 1.273342059 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 1.273342059 + -1 Combine like terms: 1 + -1 = 0 0 + x = 1.273342059 + -1 x = 1.273342059 + -1 Combine like terms: 1.273342059 + -1 = 0.273342059 x = 0.273342059 Simplifying x = 0.273342059

Subproblem 2

x + 1 = -1.273342059 Simplifying x + 1 = -1.273342059 Reorder the terms: 1 + x = -1.273342059 Solving 1 + x = -1.273342059 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -1.273342059 + -1 Combine like terms: 1 + -1 = 0 0 + x = -1.273342059 + -1 x = -1.273342059 + -1 Combine like terms: -1.273342059 + -1 = -2.273342059 x = -2.273342059 Simplifying x = -2.273342059

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.273342059, -2.273342059}

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